u.s. policy designed to push the u.s. into action. david martin reports. >> reporter: with intelligence reports iran has been working on computer simulations of nuclear explosions, israel's prime minister benjamin netanyahu scolded the obama administration for refusing to lay down a red line which would trigger a military strike. >> if iran knows that there's no red line, if iran knows that there's no deadline, what will it do? exactly what it's doing. it's continuing without any interference towards obtaining nuclear weapons capability. >> reporter: benjamin netanyahu seemed to be reacting to remarks by secretary of state hillary clinton who said there's still time to head off iran's nuclear program. >> we're not setting deadlines. we're, you know, we're, you know, watching very carefully about what they do because it's more about their actions than words.